Which animal cell junction is correctly matched
with its function?
a. adhering; allows rapid flow of substance
b. tight; holds cells together
c. gap; connects cytoplasm of adjoining cells
d. adhering; seals adjoining cells
e. gap; prevents passage of materials
Answer: c
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Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 × 107 cells per ml?
A. 4 hours B. 3 hours C. 2 hours D. 1 hour
The function of the structure labeled 9 is
a. food intake. b. digestion. c. sexual reproduction . d. water discharge. e. asexual reproduction.
The 7 characters studied by Mendel are examples of single gene traits. They are called this because:
A: there is only a single genotype for all individuals. B: distinct phenotypes are produced by variant alleles of a single gene. C: there always is 1 dominant allele and 1 recessive allele for a given character. D: all of the above
Which sentence best describes diatoms?
a. They are unicellular and autotrophic. b. They are multicellular and heterotrophic. c. They are unicellular and heterotrophic. d. They are multicellular and parasitic.